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. Author manuscript; available in PMC: 2019 Oct 10.
Published in final edited form as: Neuron. 2018 Sep 13;100(1):229–243.e3. doi: 10.1016/j.neuron.2018.08.022

Figure 5: LPTC dendrite orientation correlates with preferred direction of motion.

Figure 5:

A-F: GCaMP6f responses to dark edges moving in the preferred direction in two VS dendrites. The two dendrites have orthogonal orientations in the brain (A,D) and orthogonal preferred directions (B,E). A,D: Average projections of GCaMP6f signals. B,E: Polar plot depicting the directional tuning for the branches in A and D. Arrows indicate the PD for each branch. C,F: Spatiotemporal profiles of GCaMP6f responses to PD moving dark edges, measured at one micron increments along the length of the dendrites and plotted over time. The slope (dashed line) reflects a sequential increase in the GCaMP6f signal as the edge sweeps from distal-to-proximal along the length of the dendrite. The yellow ROIs shown on the images in A and D indicate the regions in which GCaMP6f signals were measured. G: Branch orientation plotted as a function of preferred direction of motion for populations of HS (open circles, N = 29 branches from 16 flies) and VS (black circles, N = 24 branches from 14 flies) dendrites. Pearson’s correlation coefficient = 0.87, p < 10-16.